Enhanced Enzymatic Hydrolysis of Rice Straw Pretreated by Oxidants Assisted with Photocatalysis Technology

Ken-Lin Chang; Xiao-Qin Wang; Ye-Ju Han; Hao Deng; Jing-Yong Liu; Yuan-Chung Lin

doi:10.3390/ma11050802

Enhanced Enzymatic Hydrolysis of Rice Straw Pretreated by Oxidants Assisted with Photocatalysis Technology

Materials (Basel). 2018 May 16;11(5):802. doi: 10.3390/ma11050802.

Authors

Ken-Lin Chang^{1

2}, Xiao-Qin Wang³, Ye-Ju Han⁴, Hao Deng⁵, Jing-Yong Liu⁶, Yuan-Chung Lin^{7

8}

Affiliations

¹ School of Environmental Science and Engineering and Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 51006, China. klchang@mail.nsysu.edu.tw.
² Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan. klchang@mail.nsysu.edu.tw.
³ School of Environmental Science and Engineering and Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 51006, China. gdut-xqwang@foxmail.com.
⁴ School of Environmental Science and Engineering and Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 51006, China. gduthyj@163.com.
⁵ School of Environmental Science and Engineering and Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 51006, China. lynxpatom@gmail.com.
⁶ School of Environmental Science and Engineering and Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 51006, China. www053991@126.com.
⁷ Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan. yclin@faculty.nsysu.edu.tw.
⁸ College of Pharmacy, Kaohsiung Medical University, Kaohsiung 000807, Taiwan. yclin@faculty.nsysu.edu.tw.

Abstract

This work evaluated the effectiveness of rice straw pretreatment using a TiO₂/UV system in the presence of oxidants. The effects of TiO₂ concentrations, pH and photocatalysis time were investigated. Inorganic oxidants including H₂O_2, K₂S₂O₈, and KIO₄ were added to further enhance the effect on enzymatic hydrolysis of rice straw. The TiO₂/UV/ H₂O₂ pretreatment showed a higher amount of released reducing sugar (8.88 ± 0.10 mg/mL, compared to 5.47 ± 0.03 mg/mL in untreated sample). Composition analyses of rice straw after the TiO₂/UV/H₂O₂ pretreatment showed partial lignin and hemicellulose removal. Moreover, structural features of untreated and pretreated rice straw were analyzed through FE-SEM, FT-IR, and XRD. This work suggests that H₂O₂ is an efficient addition for photocatalysis pretreatment of rice straw.

Keywords: enzymatic hydrolysis; oxidants; photocatalysis; pretreatment.